CN110647100B - PVG electro-hydraulic proportional valve control system and control method - Google Patents
PVG electro-hydraulic proportional valve control system and control method Download PDFInfo
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- CN110647100B CN110647100B CN201910982170.7A CN201910982170A CN110647100B CN 110647100 B CN110647100 B CN 110647100B CN 201910982170 A CN201910982170 A CN 201910982170A CN 110647100 B CN110647100 B CN 110647100B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21014—Interface, module with relays
Abstract
The invention discloses a PVG electro-hydraulic proportional valve control system which comprises a first power supply, a PLC (programmable logic controller), a relay, a PWM (pulse-width modulation) voltage conversion module and a control handle, wherein the first power supply is connected with the PLC; a third port of the PVG electro-hydraulic proportional valve is simultaneously connected with a first output port and a second output port of the PWM voltage conversion module and is grounded, and a first port of the PVG electro-hydraulic proportional valve is connected with a third output port of the PWM voltage conversion module; the input end of the PWM voltage conversion module is electrically connected with a PWM signal output port of the PLC controller, and the invention can avoid the condition that the proportional valve makes misoperation when the PLC controller is restarted or the PWM voltage signal output in the initialization process is 0 or the input valve voltage of the PVG electro-hydraulic proportional valve is stretched.
Description
Technical Field
The invention relates to a proportional valve control system, in particular to a PVG electro-hydraulic proportional valve control system and a control method.
Background
The working characteristic of the PVG electro-hydraulic proportional valve is that when the input valve voltage of the PVG electro-hydraulic proportional valve is 0.25-0.5 Us (Us is generally direct current supply voltage of 11-32V), the port A of the PVG electro-hydraulic proportional valve is opened; and when the valve voltage is 0.5-0.75 Us, opening B of the PVG electro-hydraulic proportional valve is opened. As shown in fig. 6, there is a certain linear relationship between the opening flow rate of the PVG electro-hydraulic proportional valve and the valve voltage, and a user can control the opening flow rate of the PVG electro-hydraulic proportional valve accordingly by controlling the valve voltage value. Therefore, if the PVG electro-hydraulic proportional valve is to work normally, the input valve voltage needs to be stabilized within a reasonable interval range. When the input valve voltage of the PVG electro-hydraulic proportional valve is 0 or too large instantly, the PVG electro-hydraulic proportional valve can generate misoperation.
As shown in fig. 5, in the conventional PVG electro-hydraulic proportional valve control system, the PLC controller 100 directly outputs different PWM voltage signals to the PVG electro-hydraulic proportional valve 200 to control different opening states of the PVG electro-hydraulic proportional valve 200. However, when the PLC controller 100 is powered off and restarted or is in a program updating state, the PWM voltage signal output by the PLC controller 100 is 0, that is, the input valve voltage of the PVG electro-hydraulic proportional valve 200 is instantly changed to 0V at this time, which will cause the PVG electro-hydraulic proportional valve 200 to malfunction and directly affect the normal operation of the whole control system.
In addition, the PWM voltage signal output by the PLC controller 100 is accurate when it is suspended, but after the PWM voltage signal output terminal 101 of the PLC controller 100 is connected to the PVG electro-hydraulic proportional valve 200, the input valve voltage value of the PVG electro-hydraulic proportional valve 200 inevitably rises, which may also cause malfunction of the PVG electro-hydraulic proportional valve 200.
Disclosure of Invention
In order to solve the technical problem, the invention provides a PVG electro-hydraulic proportional valve control system which can prevent the situation that the PVG electro-hydraulic proportional valve has misoperation when the external power supply voltage is accidentally cut off and the PWM voltage output by a PLC controller is 0V instantly.
The invention adopts the technical scheme that a PVG electro-hydraulic proportional valve control system is provided, the control system is used for controlling the opening state of the PVG electro-hydraulic proportional valve and comprises a first power supply, a PLC (programmable logic controller), a relay, a PWM (pulse-width modulation) voltage conversion module and a control handle,
the first power supply is electrically connected with the PLC and provides working voltage for the PLC;
the control handle is in communication connection with the PLC and is used for sending a control signal for controlling the work of the PVG electro-hydraulic proportional valve to the PLC;
a first input end of the relay is electrically connected with an output port of the PLC, a second input end of the relay is electrically connected with a second power supply, and an output end of the relay is electrically connected with a fourth port of the PVG electro-hydraulic proportional valve;
a third port of the PVG electro-hydraulic proportional valve is simultaneously connected with a first output port and a second output port of the PWM voltage conversion module and is grounded, and a first port of the PVG electro-hydraulic proportional valve is connected with a third output port of the PWM voltage conversion module;
and the input end of the PWM voltage conversion module is electrically connected with the PWM signal output port of the PLC.
As a preferable scheme of the present invention, the PLC controller is a controller with model number EPEC 3724.
In a preferred embodiment of the present invention, the specific model of the relay is sonchuan JD 2912C.
As a preferred embodiment of the present invention, the specific model of the PWM voltage conversion module is a large electronic SPT-PWM-DV.
As a preferable scheme of the invention, the specific model of the control handle is 4R282S1E55334 potentiometer rocker of APEM company.
As a preferable aspect of the present invention, the PLC controller includes:
a judging module for judging whether the power-on voltage of the PLC controller is greater than or equal to a preset value after the PLC controller is powered on and before the initialization of the execution program,
if yes, generating a relay connection signal and outputting the signal;
if not, generating a relay disconnection signal and outputting the signal;
the initialization module is used for initializing a PLC execution program according to a preset initialization program after the PLC is powered on, and generating and outputting an initialization completion signal after the initialization is completed;
a relay control signal sending module respectively connected with the judging module and the initializing module and used for forwarding the relay on signal or the relay off signal to the relay before the PLC executes program initialization, the relay executes on action according to the received relay on signal or executes off action according to the received relay off signal,
the relay control signal sending module is also used for forwarding the initialization completion signal to the relay after the PLC completes initialization, and the relay executes relay disconnection action according to the received initialization completion signal.
The invention also provides a PVG electro-hydraulic proportional valve control method, which is realized by applying the PVG electro-hydraulic proportional valve control system and specifically comprises the following steps:
step S1, the PLC controller judges whether the electrifying voltage is larger than or equal to a preset value,
if yes, controlling the relay to be switched on so as to directly output the electrifying voltage of the PLC to the PVG electro-hydraulic proportional valve;
if not, controlling the relay to be disconnected;
step S2, the PLC executes program initialization according to a preset initialization program;
step S3, after the initialization is completed, the PLC controller controls the relay to be disconnected;
step S4, a user sends a control signal aiming at the PVG electro-hydraulic proportional valve to the PLC controller through the control handle;
and step S5, the PLC outputs corresponding PWM voltage signals according to the received control signals, and the PVG electro-hydraulic proportional valve executes corresponding opening actions according to the received PWM voltage signals.
As a preferable embodiment of the present invention, the step S5 specifically includes the following steps:
step S51, the PLC controller outputs a corresponding PWM voltage signal to the PWM voltage conversion module according to the received control signal;
step S52, the PWM voltage conversion module converts the received PWM voltage signal into a corresponding voltage stabilization signal and outputs the signal;
and step S53, the PVG electro-hydraulic proportional valve executes corresponding opening action according to the received pressure stabilizing signal.
As a preferable aspect of the present invention, the voltage value corresponding to the preset value in step S is 12V.
According to the invention, the relay is additionally arranged between the PLC and the PVG electro-hydraulic proportional valve, and the relay is externally connected with the second power supply, so that the condition that when the PLC is restarted or is in a program updating state, a PWM voltage signal output by the PLC is instantly 0 to cause the PVG electro-hydraulic proportional valve to make misoperation can be avoided.
In addition, the PWM voltage conversion module is additionally arranged between the PLC and the PVG electro-hydraulic proportional valve, and the PWM voltage signal output by the PLC is converted into the stable voltage signal to be used as the input valve voltage of the PVG electro-hydraulic proportional valve, so that the condition that the voltage value is increased due to the fact that the PWM voltage signal is directly connected to the PVG electro-hydraulic proportional valve, and the PVG electro-hydraulic proportional valve makes misoperation can be avoided.
Drawings
FIG. 1 is a schematic structural diagram of a PVG electro-hydraulic proportional valve control system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of an internal structure of a PLC in a PVG electro-hydraulic proportional valve control system provided by an embodiment of the invention;
FIG. 3 is a diagram of method steps for implementing control of a PVG electro-hydraulic proportional valve by using a PVG electro-hydraulic proportional valve control system provided by an embodiment of the invention;
FIG. 4 is a diagram illustrating steps of a method for performing voltage stabilization conversion on a PWM voltage signal by a PVG electro-hydraulic proportional valve control system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a prior art PVG electro-hydraulic proportional valve control;
FIG. 6 is a graph of opening flow versus control voltage for a PVG electro-hydraulic proportional valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, the PVG electro-hydraulic proportional valve control system according to an embodiment of the present invention is used for controlling an opening state of a PVG electro-hydraulic proportional valve, and includes a first power supply (not shown in the figure), a PLC controller 1, a relay 2, a PWM voltage conversion module 3, and a control handle (not shown in the figure),
the first power supply is electrically connected with the PLC controller 1 and provides working voltage for the PLC controller 1;
the control handle is in communication connection with the PLC controller 1 and is used for sending a control signal for controlling the work of the PVG electro-hydraulic proportional valve to the PLC controller 1;
the first input end 21 of the relay 2 is electrically connected with the output port 11 of the PLC 1, the second input end 22 of the relay 2 is electrically connected with a second power supply, the power supply voltage of the second power supply is preferably 24V, and the output end 23 of the relay 2 is electrically connected with the fourth port 44 of the PVG electro-hydraulic proportional valve 4;
the third port 43 of the PVG electro-hydraulic proportional valve 4 is connected to the first output port 31 and the second output port 32 of the PWM voltage conversion module 3 at the same time and grounded, and the first port 41 of the PVG electro-hydraulic proportional valve 4 is connected to the third output port 33 of the PWM voltage conversion module 3;
the input end 34 of the PWM voltage conversion module 3 is electrically connected to the PWM signal output port 12 of the PLC controller 1.
In the above technical solution, the PLC controller 1 is preferably a PLC controller with the model number of EPEC 3724.
The PWM voltage conversion module 3 is preferably a PWM voltage conversion module with a model of the large electronic SPT-PWM-DV.
The specific model of the control handle is preferably 4R282S1E55334 potentiometer rocker of APEM company. The signal of brake valve handle is through the TK700 wireless remote control transmitter of technical and technical science and technology, converts analog signal into digital signal and sends for MMC wireless remote control receiver again, and MMC wireless remote control receiver receives digital signal after, transmits for PLC controller 1 through CAN bus connection, and wireless remote control transceiver exists for prior art.
Referring to fig. 2, the PLC controller 1 at least includes:
a judging module 111, configured to judge whether the power-on voltage of the PLC controller 1 is greater than or equal to a preset value after the PLC controller 1 is powered on and before the initialization of the execution program,
if yes, generating a relay connection signal and outputting the signal;
if not, generating a relay disconnection signal and outputting the signal;
an initialization module 112, configured to initialize an execution program of the PLC controller 1 according to a preset initialization program after the PLC controller 1 is powered on, and generate and output an initialization completion signal after the initialization is completed;
a relay control signal transmitting module 113, respectively connected to the judging module 111 and the initializing module 112, for transmitting a relay on signal or a relay off signal to the relay 2 before the PLC controller 1 performs program initialization, the relay 2 performing an on operation according to the received relay on signal or performing an off operation according to the received relay off signal,
the relay control signal sending module 113 is further configured to forward an initialization completion signal to the relay 2 after the PLC controller 1 completes initialization, and the relay 2 executes a relay disconnection operation according to the received initialization completion signal.
The invention also provides a PVG electro-hydraulic proportional valve control method, which is implemented by applying the PVG electro-hydraulic proportional valve control system, and with reference to fig. 3 and fig. 1, the control method specifically comprises the following steps:
in step S1, the PLC controller 1 determines whether the power-on voltage is greater than or equal to a predetermined value,
if yes, the relay 2 is controlled to be switched on, so that the electrifying voltage of the PLC 1 is directly output to the PVG electro-hydraulic proportional valve 4;
if not, the relay 2 is controlled to be switched off;
step S2, the PLC controller 1 executes program initialization according to a preset initialization program;
step S3, after the initialization is completed, the PLC controller 1 controls the relay 2 to be switched off;
step S4, a user sends a control signal aiming at the PVG electro-hydraulic proportional valve 4 to the PLC controller 1 through a control handle;
and step S5, the PLC controller 1 outputs a corresponding PWM voltage signal according to the received control signal, and the PVG electro-hydraulic proportional valve 4 executes a corresponding opening action according to the received PWM voltage signal.
In the steps of the method, the condition that the PWM voltage signal output in the process of restarting or initializing the PLC controller 1 is instantaneously 0 to cause the misoperation of the PVG electro-hydraulic proportional valve 4 can be avoided, but the condition that the PWM voltage signal is directly connected to the PVG electro-hydraulic proportional valve 4 to cause the voltage value of the input valve voltage of the PVG electro-hydraulic proportional valve 4 to be pulled up to further cause the misoperation of the PVG electro-hydraulic proportional valve 4 can not be avoided.
In order to avoid the voltage value rising caused by the PWM voltage signal output by the PLC controller 1 directly accessing the PVG electro-hydraulic proportional valve 4 and the occurrence of the condition that the PVG electro-hydraulic proportional valve 4 malfunctions, referring to fig. 4, preferably, the step S5 specifically includes the following steps:
step S51, the PLC controller 1 outputs a corresponding PWM voltage signal to the PWM voltage conversion module 3 according to the received control signal;
step S52, the PWM voltage conversion module 3 converts the received PWM voltage signal into a corresponding voltage-stabilizing signal and outputs the signal;
in step S53, the PVG electro-hydraulic proportional valve 4 performs a corresponding opening action according to the received pressure stabilizing signal.
In the above technical solution, the voltage value corresponding to the preset value in step S2 is preferably 12V.
It should be noted that the model number of the PLC controller 1 in step S1 is preferably the controller of EPEC 3724; the model of the relay 2 in the step S2 is preferably matsutake JD 2912C; the model of the PWM voltage conversion module 3 in step S41 is preferably a large electronic SPT-PWM-DV; the specific model of the control handle in the step S3 is 4R282S1E55334 potentiometer rocker of APEM company.
The specific method and process for controlling the work of the PVG electro-hydraulic proportional valve by the PVG electro-hydraulic proportional valve control system provided by the embodiment of the invention are briefly described as follows:
referring to fig. 1, after the system powers on the PLC controller 1, before the PLC controller 1 initializes the program, the PLC controller 1 first determines whether the power-on voltage is greater than or equal to 12V, if so, the digital output port D0 of the PLC controller 1, that is, the output port 11 of the PLC controller 1, is true, and then the PLC controller 1 controls the pin No. 30 of the relay 2 (that is, the second input port 22 of the relay 2) and the pin No. 87 of the relay 2 (that is, the output port 23 of the relay 2) to be turned on, so as to directly output the power-on voltage to the PVG electro-hydraulic proportional valve 4 through the output port 11 before the PLC controller 1 executes the program initialization, this can avoid the PLC controller in the PVG electro-hydraulic proportional valve control system in the prior art from performing an initialization action, and under the condition that the output PWM voltage signal is 0, the PVG electro-hydraulic proportional valve performs the false action of fully opening the flow of the port A.
After the PLC controller 1 completes initialization, the PLC controller 1 disconnects the control relay 2, and at the moment, the PLC controller 1 starts to normally output PWM voltage signals to the PVG electro-hydraulic proportional valve. Subsequently, the PLC 1 acquires control signals of the control handle to control the opening size and the opening direction of the PVG electro-hydraulic proportional valve 4. The PWM voltage signal is an output signal for controlling the work of the PVG electro-hydraulic proportional valve 4. However, due to the inherent characteristics of the PVG electro-hydraulic proportional valve 4, the PWM voltage signal output by the PLC controller 1 is accurate in suspension, but once the PWM voltage signal is connected to the PVG electro-hydraulic proportional valve 4, for example, after the PWM voltage signal is connected to pin 1 of the PVG electro-hydraulic proportional valve 4, the voltage value of the input valve voltage of the PVG electro-hydraulic proportional valve 4 corresponding to the PWM voltage signal is pulled up, and when the pulled up voltage value exceeds the range of the reasonable input valve voltage value of the PVG electro-hydraulic proportional valve 4, the malfunction of the PVG electro-hydraulic proportional valve 4 may be caused. Therefore, in order to solve the problem, the invention adds the PWM voltage conversion module 3 between the PLC controller 1 and the PVG electro-hydraulic proportional valve 4 to convert the PWM voltage signal output by the PLC controller 1 into a corresponding voltage stabilization signal through the PWM voltage conversion module 3, and then outputs the voltage stabilization signal to the PVG electro-hydraulic proportional valve 4, so as to realize the accurate control of the work of the PVG electro-hydraulic proportional valve 4.
In conclusion, the invention can avoid the condition that when the PLC controller is restarted or is in a program updating state, the PWM voltage signal output by the PLC controller is instantaneously 0 to cause the PVG electro-hydraulic proportional valve to make misoperation. In addition, the invention can also avoid the condition that the voltage value is increased due to the direct access of the PWM voltage signal to the PVG electro-hydraulic proportional valve, so as to cause the PVG electro-hydraulic proportional valve to make misoperation.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A PVG electro-hydraulic proportional valve control system is used for controlling the opening state of a PVG electro-hydraulic proportional valve and is characterized by comprising a first power supply, a PLC (programmable logic controller) 1, a relay 2, a PWM voltage conversion module 3 and a control handle,
the first power supply is electrically connected with the PLC (1) and provides working voltage for the PLC (1);
the control handle is in communication connection with the PLC (1) and is used for sending a control signal for controlling the work of the PVG electro-hydraulic proportional valve (4) to the PLC (1);
the relay (2) comprises a relay coil, a movable contact and a fixed contact; one end, namely a first input end (21), of the relay coil is electrically connected with an output port (11) of the PLC (1), and the other end of the relay coil is grounded; the moving contact, namely a second input end (22), of the relay (2) is electrically connected with a second power supply, and the fixed contact, namely an output end (23), of the relay (2) is electrically connected with a fourth port (44) of the PVG electro-hydraulic proportional valve (4);
a third port (43) of the PVG electro-hydraulic proportional valve (4) is simultaneously connected with a first output port (31) and a second output port (32) of the PWM voltage conversion module (3) and is grounded, and a first port (41) of the PVG electro-hydraulic proportional valve (4) is connected with a third output port (33) of the PWM voltage conversion module (3);
an input end (34) of the PWM voltage conversion module (3) is electrically connected with a PWM signal output port (12) of the PLC controller (1), wherein,
an output port (11) of the PLC (1) is a DO port of the PLC; a first output port (31) of the PWM voltage conversion module (3) is a first ground port, a second output port (32) of the PWM voltage conversion module (3) is a second ground port, a third output port (33) of the PWM voltage conversion module (3) is a voltage output port, and an input port (34) of the PWM voltage conversion module (3) is a PWM signal input port; a first port (41) of the PVG electro-hydraulic proportional valve (4) is a voltage input port, a third port (43) of the electro-hydraulic proportional valve (4) is a grounding port, and a fourth port (44) of the electro-hydraulic proportional valve (4) is a power supply voltage port;
the PLC controller judges whether the electrifying voltage is greater than or equal to a preset value, if so, the relay is controlled to be switched on, and the electrifying voltage of the PLC controller is directly output to the PVG electro-hydraulic proportional valve; and if not, controlling the relay to be disconnected.
2. The PVG electro-hydraulic proportional valve control system of claim 1, wherein the PLC controller (1) is a controller model EPEC 3724.
3. The PVG electro-hydraulic proportional valve control system of claim 1, wherein the specific model of the relay (2) is Songchang JD 2912C.
4. The PVG electro-hydraulic proportional valve control system of claim 1, wherein the specific model of the PWM voltage conversion module (3) is a Shuobo electronic SPT-PWM-DV.
5. The PVG electro-hydraulic proportional valve control system of claim 1, wherein the control handle is a 4R282S1E55334 potentiometer rocker, APEM corporation, specific model.
6. The PVG electro-hydraulic proportional valve control system of claim 1, wherein the PLC controller (1) comprises:
a judging module (111) for judging whether the power-on voltage of the PLC controller (1) is greater than or equal to a preset value after the PLC controller (1) is powered on and before the initialization of the execution program,
if yes, generating a relay connection signal and outputting the signal;
if not, generating a relay disconnection signal and outputting the signal;
the initialization module (112) is used for initializing a PLC execution program according to a preset initialization program after the PLC (1) is powered on, and generating and outputting an initialization completion signal after the initialization is completed;
a relay control signal sending module (113) respectively connected to the judging module (111) and the initializing module (112) and configured to forward a relay (2) turn-on signal or a relay (2) turn-off signal to the relay (2) before the PLC controller (1) performs program initialization, wherein the relay (2) performs a turn-on operation according to the received relay turn-on signal or performs a turn-off operation according to the received relay turn-off signal,
the relay control signal sending module (113) is further configured to forward the initialization completion signal to the relay (2) after the PLC controller (1) completes initialization, and the relay (2) executes a relay disconnection action according to the received initialization completion signal.
7. A PVG electro-hydraulic proportional valve control method, which is realized by applying the PVG electro-hydraulic proportional valve control system of any one of claims 1-6, and is characterized by comprising the following steps:
step S1, the PLC controller judges whether the electrifying voltage is larger than or equal to a preset value,
if yes, controlling the relay to be switched on so as to directly output the electrifying voltage of the PLC to the PVG electro-hydraulic proportional valve;
if not, controlling the relay to be disconnected;
step S2, the PLC executes program initialization according to a preset initialization program;
step S3, after the initialization is completed, the PLC controller controls the relay to be disconnected;
step S4, a user sends a control signal aiming at the PVG electro-hydraulic proportional valve to the PLC controller through the control handle;
and step S5, the PLC outputs corresponding PWM voltage signals according to the received control signals, and the PVG electro-hydraulic proportional valve executes corresponding opening actions according to the received PWM voltage signals.
8. The PVG electro-hydraulic proportional valve control method of claim 7, wherein the step S5 specifically comprises the steps of:
step S51, the PLC controller outputs a corresponding PWM voltage signal to the PWM voltage conversion module according to the received control signal;
step S52, the PWM voltage conversion module converts the received PWM voltage signal into a corresponding voltage stabilization signal and outputs the signal;
and step S53, the PVG electro-hydraulic proportional valve executes corresponding opening action according to the received pressure stabilizing signal.
9. The PVG electro-hydraulic proportional valve control method of claim 7, wherein the preset value in the step S1 corresponds to a voltage value of 12V.
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Address after: 415106 Guanxi Town, Dingcheng District, Changde City, Hunan Province Patentee after: Zhonglian Hengtong Machinery Co.,Ltd. Address before: 410000 No.88, south section of Dongliu Road, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province (large tonnage chassis assembly plant of Zoomlion) Patentee before: CHANGSHA ZHONGLIAN HENGTONG MACHINERY Co.,Ltd. |